"Two years ago, Congress ordered the nation’s gasoline refiners to do something that is turning out to be mathematically impossible.

To please the farm lobby and to help wean the nation off oil, Congress mandated that refiners blend a rising volume of ethanol and other biofuels into gasoline. They are supposed to use at least 15 billion gallons of biofuels by 2012, up from less than seven billion gallons in 2007.

But nobody at the time counted on fuel demand falling in the United States, which is what has happened during the recession. And that decline could well continue, as cars become more efficient under other recent government mandates."